Why not teach languages to younger students?
There are many programs now available for younger students. In our experience, however, these programs demand a lot of busy work but deliver very little in the way of learning the functional nuts-and-bolts of Classical languages. Students are not generally prepared to master these languages until they have reached the logic stage. You will accomplish much more in a fraction of the time if you wait until your student is 12 to 15 before you start formal instruction in Latin and Greek. Better still, waiting to start these logic based languages may mean your student will enjoy them more.